The phrase "an existing class" is correct and usable in written English.
It can be used when referring to a class that is already established or in existence, often in contexts related to education, programming, or categorization.
Example: "In our programming course, we will build upon the concepts learned in an existing class to enhance our understanding of object-oriented programming."
Alternatives: "a current class" or "an established class".
Perhaps inevitably, the movie has strong echoes of a documentary, not only because it was shot in a kindergarten in Anzin, outside Valenciennes, with an existing class cast as Daniel's pupils, but also because improvisation is unavoidable when filming tiny children.
In our approach no novel class instance is declared as an existing class instance.
In the proposed approach the data stream will be either classified into an existing class or into a novel class.
This will avoid misclassification of concept drift as outlier and reduce false alarm rate [misclassifying an existing class instance as novel class instance].
In short, it can be concluded that other existing approaches had certain novel class instances that were classified as existing class instances but in research work presented in the paper the approach did not classify any novel class instance as an existing class instance.
This approach allows us to change the database schema without breaking an existing class that might reference the class at hand.
Although its tail organisation is similar to that of class-VII myosins, the motor domain of MyoG does not group into any existing class.
If the expression "aesthetic object" is, therefore, taken in its intentional construction, the study of the aesthetic object becomes the study, not of an independently existing class of things, but of the aesthetic experience itself.
No isolate was resistant to all existing classes.
Except for voting rights, the Class C shares will have the same rights as the existing Class A and Class B shares.
The parallels are many: explicit criticism of the monarchy as a pillar of the existing class system; the toughest hard rock as the most effective method of making your point; lyrics that are a blast of eloquent rage from the standpoint of an outsider – in each case a young man of Irish extraction.
